isc-dhcp: add dynamic dns integration for local bind server
Start after named is running. Add support for "cname", "domain", "mxhost", and "srvhost" configs. Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
This commit is contained in:
Philip Prindeville
parent
75458e78a8
commit
3a07e294a9
2 changed files with 191 additions and 3 deletions
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@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
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PKG_NAME:=isc-dhcp
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UPSTREAM_NAME:=dhcp
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PKG_VERSION:=4.4.1
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PKG_RELEASE:=11
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PKG_RELEASE:=12
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PKG_LICENSE:=BSD-3-Clause
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PKG_LICENSE_FILES:=LICENSE
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@ -109,12 +109,14 @@ define Package/isc-dhcp-server-ipv4
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$(call Package/isc-dhcp/Default)
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TITLE+= server (without IPv6)
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VARIANT:=ipv4
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DEPENDS+=bind-server bind-client
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endef
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define Package/isc-dhcp-server-ipv6
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$(call Package/isc-dhcp/Default)
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TITLE+= server (with IPv6)
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VARIANT:=ipv6
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DEPENDS+=bind-server bind-client
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endef
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define Package/isc-dhcp-server/description
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@ -1,12 +1,23 @@
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#!/bin/sh /etc/rc.common
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START=19
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START=25
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USE_PROCD=1
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PROG=/usr/sbin/dhcpd
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TTL=3600
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PREFIX="update add"
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lease_file=/tmp/dhcpd.leases
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config_file=/tmp/run/dhcpd.conf
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dyndir=/tmp/bind
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conf_local_file=$dyndir/named.conf.local
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session_key_name=local-ddns
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session_key_file=/var/run/named/session.key
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dyn_file=$(mktemp -u /tmp/dhcpd.XXXXXX)
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time2seconds() {
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local timestring=$1
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local multiplier number suffix
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@ -67,12 +78,36 @@ typeof() {
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'
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}
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rev_quad() {
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local ip="$1"
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echo "$ip" | awk -F '.' '{ printf "%s.%s.%s.%s\n", $4, $3, $2, $1; }'
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}
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update() {
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local lhs="$1" family="$2" type="$3"
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shift 3
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echo -e "$PREFIX" "$lhs $family $type $@\nsend"
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}
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explode() {
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local arg="$1"
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echo "$arg" | sed -e 's/\./, /g'
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}
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create_empty_zone()
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{
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local zone="$1"
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if [ ! -f $dyndir/db."$zone" ]; then
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cp -p /etc/bind/db.empty $dyndir/db."$zone"
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chmod g+w $dyndir/db."$zone"
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chgrp bind $dyndir/db."$zone"
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fi
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}
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append_routes() {
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local tuple tuples="$1"
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local string=
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@ -122,6 +157,85 @@ append_dhcp_options() {
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echo " option $tag $formatted;"
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}
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static_cname_add() {
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local cfg="$1"
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local cname target
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config_get cname "$cfg" "cname"
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[ -n "$cname" ] || return 0
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config_get target "$cfg" "target"
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[ -n "$target" ] || return 0
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update "$cname.$domain." IN CNAME "$target.$domain."
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}
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static_cnames() {
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config_foreach static_cname_add cname "$@"
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}
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static_domain_add() {
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local cfg="$1"
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local name ip revip
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config_get name "$cfg" "name"
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[ -n "$name" ] || return 0
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config_get ip "$cfg" "ip"
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[ -n "$ip" ] || return 0
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revip="$(rev_quad "$ip")"
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update "$name.$domain." IN A "$ip"
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update "$revip.in-addr.arpa." IN PTR "$name.$domain."
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}
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static_domains() {
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config_foreach static_domain_add domain "$@"
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}
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static_mxhost_add() {
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local cfg="$1"
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local domain2 relay pref
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config_get domain2 "$cfg" "domain"
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[ -n "$domain2" ] || return 0
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config_get relay "$cfg" "relay"
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[ -n "$relay" ] || return 0
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config_get pref "$cfg" "pref"
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[ -n "$pref" ] || return 0
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if [ "$domain2" = "@" ]; then
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update "$domain." IN MX "$pref" "$relay.$domain."
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else
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update "$domain2.$domain." IN MX "$pref" "$relay.$domain."
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fi
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}
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static_mxhosts() {
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config_foreach static_mxhost_add mxhost "$@"
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}
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static_srvhost_add() {
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local cfg="$1"
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local srv target port priority weight
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config_get srv "$cfg" "srv"
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[ -n "$srv" ] || return 0
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config_get target "$cfg" "target"
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[ -n "$target" ] || return 0
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config_get port "$cfg" "port"
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[ -n "$port" ] || return 0
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config_get priority "$cfg" "priority"
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[ -n "$priority" ] || return 0
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config_get weight "$cfg" "weight"
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[ -n "$weight" ] || return 0
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update "$srv.$domain." IN SRV "$priority" "$weight" "$port" "$target"
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}
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static_srvhosts() {
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config_foreach static_srvhost_add srvhost "$@"
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}
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static_host_add() {
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local cfg="$1"
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local broadcast hostid macn macs mac name ip leasetime
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@ -278,6 +392,7 @@ general_config() {
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config_get log_facility "isc_dhcpd" "log_facility"
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config_get domain "isc_dhcpd" "domain"
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config_get_bool dynamicdns "isc_dhcpd" dynamicdns 0
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[ $always_broadcast -eq 1 ] && echo "always-broadcast true;"
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[ $authoritative -eq 1 ] && echo "authoritative;"
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@ -288,6 +403,56 @@ general_config() {
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max_lease_time="$(time2seconds "$max_lease_time")"
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[ "$?" -ne 0 ] && return 1
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if [ $dynamicdns -eq 1 ]; then
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create_empty_zone "$domain"
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create_empty_zone "168.192.in-addr.arpa"
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cat <<EOF > $conf_local_file
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zone "$domain" {
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type master;
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file "$dyndir/db.$domain";
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allow-update { key $session_key_name; };
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allow-transfer { key $session_key_name; };
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};
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zone "168.192.in-addr.arpa" {
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type master;
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file "$dyndir/db.168.192.in-addr.arpa";
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allow-update { key $session_key_name; };
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allow-transfer { key $session_key_name; };
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};
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EOF
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/etc/init.d/named reload
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sleep 1
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cat <<EOF
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ddns-domainname "$domain.";
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ddns-update-style standard;
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ddns-updates on;
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ignore client-updates;
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update-static-leases on;
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use-host-decl-names on;
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update-conflict-detection off;
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update-optimization off;
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include "$session_key_file";
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zone $domain. {
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primary 127.0.0.1;
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key local-ddns;
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}
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zone 168.192.in-addr.arpa. {
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primary 127.0.0.1;
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key local-ddns;
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}
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EOF
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fi
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if [ -n "$log_facility" ] ; then
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echo "log-facility $log_facility;"
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fi
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@ -312,7 +477,7 @@ boot() {
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}
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start_service() {
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local domain dhcp_ifs authoritative
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local domain dhcp_ifs authoritative dynamicdns
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if [ -n "$DHCPD_BOOT" ] ; then
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return 0
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@ -335,6 +500,27 @@ start_service() {
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static_hosts >> $config_file
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if [ $dynamicdns -eq 1 ]; then
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cat <<EOF > $dyn_file
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; Generated by /etc/init.d/dhcpd at $(date)
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ttl $TTL
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EOF
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static_cnames >> $dyn_file
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static_domains >> $dyn_file
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static_mxhosts >> $dyn_file
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static_srvhosts >> $dyn_file
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nsupdate -l -v $dyn_file
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rm -f $dyn_file
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fi
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[ -z "$dhcp_ifs" ] && return 0
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fi
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